@karsten13 to get this right: Using the fat image would have at least python on board. And to get everything to work I would need to add a script, adding the dependencies for MMM-FRITZ-Box-Callmonitor-py3:
Execute npm install to install the dependencies.
(Optional) Execute sudo apt-get install python3-dev libxml2-dev libxslt1-dev zlib1g-dev && sudo pip install --break-system-packages fritzconnection to allow access to your FRITZ!Box phone book and recent calls. This can take a few minutes.
Will definitely give it a try!
